1) The M3 has always been improved with every new generation.
2) From a handling point the comparison cars you listed are no where near the qualety and handling capabileties of the M3.
3) HP is not always the answer, unless your only objective is the track.
In the end I would wait until the new M3/M4 is out as you know there are several factors that decide who crosses the finish line first. The BMW Engineering Team is one of the best in the world others follow them so all I can say is wait and see.